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M. M. GREENWADE.

DRAFT APPARATUS FOR STEAM BOILERS.

No. 310,198. I Patented Jan. 6, 1885 E3 2/ v o 00 0 00%..

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DRAFT APPARATUS FOR STEAM-BOILERS.

FFECIFICATEQf-Y forming part of Letters Patent No. 310,198, dated January 6, 1885;

Application filed January 29, is;

.To a. whom it may concern.-

Be it known that I, Mosns M. UREEN- WADE, of the city of Cincinnati, Hamilton county, and State of Ohio, have invented certain new and useful Improvements in Draft Apparatus for Steam-Boilers, of which the fol lowing is a specification.

My invention relates to that class of steamengine boilers commonly used for locomotive steanrengines; and it consists in certain new and useful improvements for increasing the draft in the smokestacks of the same, and for utilizing the waste steam from one boiler for heating the water in another boiler.

Referring to the drawings forming part of this specification, Figure l is a sectional end view ot'aportion of alocomotive steam-engine, illustrating certain features of my invention. Fig. 2 is a side elevation of the boiler of the said locomotive, and illustrating certain features of my invention; and Fig. 3 is an eularged view of the device for enabling me to conduct steam either to the front or rear of the boiler.

Similar parts are similarly desiguated iu this description. I

A is the boiler, having the usual tubes, a, This boiler A is constructed with the usual fire-box, C, and steam-dome C. The exhaust-pipes D D connect the cylinders D D with the smoke stack D in the usual manner. The draft-pipe E is preferably connected with the steam-dome G at the top of that part which would be in the cab, and at its point of connection with said steam-dome is provided with the stop cock E. The pipe E runs along the side of the boiler and enters the smoke-box B, es-- tablishing communication between the steamdome and the smoke-box at the opposite end of the boiler, and through this draft-pipe steam may be conveyed to the smoke-box to increase the draft in the boiler. This draftpipe as now constructed and employed in locomotives can only be of service after steam has been generated in the boiler to which it is connected, as it is only intended to conduct steam from the steam-dome to the smoke-box at the opposite end of the same boiler, and it is when a fire is first started under the boiler and before steam has begun to be produced No model.)

At some point in the pipe E (preferably near the end which is toward the smoke-box of the locomotive) is placed the connecting box or switch 11*. This box has a straightpassage, 7), in line with the pipe E, and this passage is provided with a valve, I), for controlling or preventing the passage of steam through the pipe E. This box is alsoprovided with two side passages, (l (1, connecting with the passage 1; at either side of the valve 1), the side passages being curved, as shown in Fig. 3, to give the steam an impulse in the direction it is to take in the pipe E. these passages (I (7/ steam is introduced either to the steam-dome or to the smokebox, as hereinafter described.

In the engine-house, at a point above the locomotive, is located a supply-pipe, H, which receives its supply of steam from a boiler located in some part of the house. From this pipe H, at the side of each stall, depends the drop-pipe G, having a horizontal arm, G, extending toward the center of the stall, and this arm is provided with a val vc, K, to con trol the passage of steam through the pipe. To this arm G is connected one end of a flexible pipe or tube, F, the other end of which is to be attached to the switch-box E when it is desired to introduce steam to the engine.

When it is desired to increase the draft to hasten the fire,the free end of the pipe F is con nected to the nozzle d of the passage (1, and the valve 1) is closed to prevent the backward passage of the steam through the pipe E. The valve K is now opened, and steam from the supply-pipe H passes down through the pipes G and F and enters the pipe E through the switch-box FF and escapes into the smoke box 13, being directed upward toward the smoke-stack by the end of the pipe, as shown in Fig. 1. This causes a strong draft, and the fire in the fire-chamber will. burn readily from the start, and thus steam may be generated and the engine be ready to start on its journey in a very short time, thus saving a great deal of timeas well as fuel, and there is no inconvenience arising from smoke in the cab of Through IOO the engine. As before stated, this additional draft cannot beproduced in engines as now constructed until some time after the fire has been started and steam has been generated in the boiler, and while this is being done a great deal of smoke escapes into the cab. After the fire has been thoroughly started and steam has been generated in the boiler, the pipe F may be detached and the passage closed by a suitable cap or stopper, and the valves 1) and E being opened,steam conducted from the steamdome through the pipe E to the smoke-box, and a strong draft be maintained.

Instead of taking the steam from the supply-pipe H, it may be taken from another locomotive by simply connecting the pipe E on one locomotive to the pipe E on the other comotive, and this will be found very convenient for utilizing the waste steam from a locomotive coming in from the road, and from which it is desired to blow cfi' the steam.

Instead of conveying the steam into the smoke-box, it may, if desired. be conveyed into the steanrdome by connecting the pipe E to the nozzle (1 of the passage (1, closing the valve 1), and opening the valve E. The advantage of this is that the water in the boiler may be heated before the fire is started, and thus the lines of the boiler be greatly protected, as it is very injurious to the fines to conduct the hot smoke and products of co1nbustion through them while surrounded by cold water. Another advantage of this latter feature is that the steam introduced into the steam-dome may be utilized to move the engine in the stall, where now it requires the employment of levers to accomplish this end.

The great advantages obtained by the employment of my invention will be fully ap parent from the above description.

Z and the curved side passages, 61 cl, for in troducing steam from an outside source either to the smoke-stack or steam-space of theboiler, substantially as and for the purposes specified.

2. The combination of draft-pipe E, connected at one end to the upper portion of firebox,steam-dome, and cock controlling the passage through pipe E to and from said steamdome, the pipe E opening at its forward end in the fire-box B of the locomotive, and located between the exhaust-orifice ot' the cyl inders D D, and valve E", located in pipe E, and provided with cock I) in passage-way I), forming a part of the direct passageway through pipe E, and further provided with curved passages d (2, respectively opening into the pipe E at opposite sides of cock 1), these passages d (2 being respectively provided with nozzles d and d, and overhead pipe H, connected to a steam-supply, and rigid down-pipe G, connected at its upper end to pipe H and at its lower end provided with horizontal branch G, having cock for controlling the passage through said branch G, and the flexible pipe F, connecting the free end of branch pipe G to one or the other of the nozzles d or d, and adapted to be con-' nected or disconnected from said pipes at pleasure, substantially as and for the purposes specified. 

